Réponse:
a) 4 + a = -7
a = - 7 - 4
a = -11
b) 6 - a = 13
- a = 13 - 6
- a = 7
c) 4a - 2 = 10
4a = 10 + 2
4a = 12
a = 12÷4 = 3
d) 5a + 2 = 8a - 3
5a - 8a = - 3 - 2
- 3a = - 5
a = - 5 ÷ (- 3) = 1,66
e) 2a - 3 = 4 ÷ 3 + a
2a - a = 4 ÷ 3 + 3
a = 1,33 + 3
a = 4,33
f) 2 ( 3a + 7 ) = 4 ( - 2a + 1 )
2 × 3a + 2 × 7 = 4 × (-2a) + 4 × 1
6a + 14 = - 8a + 4
6a + 8a = 4 - 14
14a = - 10
a = - 10 ÷ 14
a = - 0,74
Explications étape par étape:
Bonsoir j'espère que ce sera juste
